APA (7th ed.) Citation

Walker, B. J., & Blake, I. F. (1977). Computer security and protection structures. Dowden, Hutchinson & Ross.

Chicago Style (17th ed.) Citation

Walker, Bruce J., and Ian F. Blake. Computer Security and Protection Structures. Stroudsburg, Pa: Dowden, Hutchinson & Ross, 1977.

MLA (9th ed.) Citation

Walker, Bruce J., and Ian F. Blake. Computer Security and Protection Structures. Dowden, Hutchinson & Ross, 1977.